.nav {
  width: 100%;
  position: fixed;
  top: 0;
  margin-right: -50%;
  /* 宽度的一半 */
}

.border {
  width: 100%;
  display: flex;
  flex-direction: column;
}

.top {
  width: 100%;
}

.top-content {
  padding: 90px 0 30px 0;
  width: 100%;
}

.top-continer {
  width: 1280px;
  padding: 0 15px;
  margin: 0 auto;
}

.top-continer .large {
  width: 1250px;
  padding: 0 110px;
}

.top-continer .large div .f1 h1 {
  padding: 6px;
  font-size: 48px;
  line-height: 1.25em;
  font-weight: 700;
  text-align: center;
}

.f2 p {
  line-height: 1.75em;
  font-weight: 600;
  text-align: center;
  padding: 10px 0;
}


/*  */
.bottom {
  width: 100%;
}

.bottom-content {
  width: 100%;
  padding: 15px 0 90px 0;
}

.bottom-continer {
  width: 1280px;
  margin: 0 auto;
}

.bottom-continer .large {
  width: 1280px;
  padding: 0 110px;
}

.bottom-continer .large .card {
  display: flex;
  justify-content: center;
  flex-wrap: nowrap;
}

.bottom-continer .large .card .box-card {
  width: 500px;
  padding: 0 15px;
  margin: 0 10px;
}

.bottom-continer .large .card .box-card .continer {
  padding: 15px 15px 5px 15px;
}

.bottom-continer .large .card .box-card .continer>div {
  width: 100%;
}

.bottom-continer .large .card .box-card .continer .top h2 {
  font-size: 28px;
  padding: 10px 0;
  line-height: 1.25em;
  font-weight: 700;
  text-transform: none;
}

.bottom-continer .large .card .box-card .continer .center p {
  padding: 10px 0;
  font-size: 15px;
  line-height: 1.667em;
  font-weight: 400;
}

.bottom-continer .large .card .box-card .continer .center ul {
  margin: 7px 0;
  padding-left: 20px;
}

.bottom-continer .large .card .box-card .continer .center ul li {
  font-weight: normal;
  font-size: 16px;
  line-height: 30px;
  list-style: disc;
}

.bottom-continer .large .card .box-card .continer .bottom .text {
  display: flex;
  flex-direction: column;
  width: 100%;
  margin-bottom: 15px;
}

.bottom-continer .large .card .box-card .continer .bottom .text a {
  color: #76b900;
  font-weight: 700;
  margin: 10px 0;
}

.bottom-continer .large .card .box-card .continer .bottom .text a span:first-child {
  margin-right: 5px;
}